The one thing I WOULD like to see is better party diversity in 72-mans. No reason for the system to place 4 healers in the same party while the other two have 0. Same situation with tanks - HP party buff and tank LB are great tools and there's nothing like a party having 3 while the other two parties are all healers/DPS.

Forcing composition would murder queues, but the game could at LEAST attempt some sort of algorithm in how players from an overarching pool are placed into parties.